<9. Advanced Engineering >
3. When distributing cascade signal
When distributing the output from one controller to multiple blocks, read back will be
incorrect if the distribution is implemented using link branching.
In the figure below, the output of NPAS_PID_1 is distributed to NPAS_PID_1 and
NPAS_PID_2 using link branching.
In this logic, a read back connection is made between NPAS_PID_1 and
NPAS_PID_2 but not between NPAS_PID_1 and NPAS_PID_3.
To split this kind of cascade signal, use an NPAS_FOUT.
In the figure below, the read back input from NPAS_PID_2 and NPAS_PID_3 is
connected to NPAS_FOUT_1, and the read back of NPAS_FOUT_1 is connected to
NPAS_PID_1. This allows the read back inputs of both NPAS_PID_2 and
NPAS_PID_3 to be connected to NPAS_PID_1.
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